Hematopathology Practice Questions

Q: What is the term for localized Langerhans cell histiocytosis affecting the head and neck?

Eosinophilic granuloma. **Explanation:** **Langerhans Cell Histiocytosis (LCH)** is a spectrum of disorders characterized by the clonal proliferation of Langerhans cells (expressing CD1a, S100, and CD207/Langerin) [1]. The clinical presentation depends on the extent of involvement. **Why Eosinophilic Granuloma is correct:** **Eosinophilic Granuloma** is the most benign and localized form of LCH. It typically presents as a **solitary, osteolytic lesion** in the bones, most commonly affecting the skull (head), mandible (neck), ribs, or femur. It is usually seen in older children or young adults and carries an excellent prognosis. **Analysis of Incorrect Options:** * **A. Letterer-Siwe disease:** This is the **acute disseminated** (multisystem) form of LCH, typically occurring in infants under age 2. It involves multiple organs (skin, liver, spleen, bone marrow) and has a poor prognosis. * **B. Pulmonary LCH:** This is a localized form specifically affecting the lungs, almost exclusively seen in **adult smokers**. While localized, it is not the classic term for head and neck bone involvement. * **Hand-Schüller-Christian disease (Note):** Though not an option, this is the chronic disseminated form characterized by the classic triad of calvarial bone defects, diabetes insipidus, and exophthalmos. **NEET-PG High-Yield Pearls:** 1. **Birbeck Granules:** Pathognomonic electron microscopy finding; described as **"tennis-racket"** shaped pentalaminar structures [1]. 2. **Immunohistochemistry (IHC):** Positive for **CD1a, S100, and Langerin (CD207)** [1]. 3. **BRAF V600E Mutation:** Present in approximately 50% of LCH cases [1]. 4. **Radiology:** "Punched-out" radiolucent lesions without a sclerotic rim are characteristic in the skull. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Diseases of White Blood Cells, Lymph Nodes, Spleen, and Thymus, pp. 629-630.

Q: What is the main cause of congestive splenomegaly?

Banti syndrome. **Explanation:** **Banti Syndrome (Non-Cirrhotic Portal Fibrosis)** is the correct answer because it is the classic prototype of **congestive splenomegaly**. The underlying medical concept involves an increase in portal venous pressure (portal hypertension) due to pre-hepatic or intra-hepatic (non-cirrhotic) obstruction [1]. This back-pressure leads to chronic venous congestion of the spleen, resulting in massive splenomegaly, hypersplenism (anemia, leukopenia, thrombocytopenia), and esophageal varices, typically in the absence of primary liver cirrhosis [1]. **Analysis of Incorrect Options:** * **Congestive Cardiac Failure (CCF):** While CCF causes systemic venous congestion, it primarily leads to **congestive hepatomegaly** ("nutmeg liver") [2]. Splenomegaly in CCF is usually mild and occurs only if secondary cardiac cirrhosis develops. * **Malaria:** This causes splenomegaly due to **reticuloendothelial hyperplasia** (increased clearance of parasitized RBCs) and immune activation, rather than passive venous congestion. * **DIC:** This is a consumptive coagulopathy characterized by microvascular thrombosis and hemorrhage. It does not typically cause splenomegaly. **High-Yield Clinical Pearls for NEET-PG:** * **Banti’s Syndrome** is often used interchangeably with **Non-Cirrhotic Portal Fibrosis (NCPF)** in the Indian subcontinent. * **Microscopic hallmark:** Fibrosis of the Malpighian corpuscles and the presence of **Gandy-Gamma bodies** (siderofibrotic nodules containing calcium and iron) are characteristic of chronic congestive splenomegaly. * **Key differentiator:** In Banti syndrome, liver function tests (LFTs) are usually normal, unlike in cirrhosis [1].

Q: A child presents with Hb of 6.5 gm%, MCV of 65, MCH of 15, and protoporphyria with a much reduced red cell distribution width. What is the most likely diagnosis?

Iron deficiency anemia. This question tests your ability to differentiate between microcytic hypochromic anemias using red cell indices and biochemical markers. ### **Explanation of the Correct Answer** The patient presents with **Iron Deficiency Anemia (IDA)**. * **Microcytic Hypochromic Picture:** Hb 6.5 g%, MCV 65 fL (low), and MCH 15 pg (low) indicate microcytic hypochromic anemia. * **Protoporphyria:** In IDA, iron is unavailable to combine with protoporphyrin to form Heme. This leads to an accumulation of **Free Erythrocyte Protoporphyrin (FEP)**, a classic biochemical marker for IDA. * **RDW (Red Cell Distribution Width):** While the question mentions a "reduced" RDW, it is important to note that in clinical practice, IDA typically shows an **increased RDW** (anisocytosis). However, among the given options, the combination of microcytosis and elevated protoporphyrin is pathognomonic for IDA. ### **Why Other Options are Incorrect** * **Thalassemia:** While it presents with a low MCV and very low RDW (Mentzer index <13), **protoporphyrin levels are normal** because there is no defect in heme synthesis; the defect lies in globin chain production. * **Porphyria:** These are enzymatic defects in the heme synthesis pathway. While they involve protoporphyrins, they do not typically present with this specific microcytic blood picture or low iron indices. * **Megaloblastic Anemia:** This is a **macrocytic** anemia (MCV >100 fL), which contradicts the provided MCV of 65. ### **NEET-PG High-Yield Pearls** 1. **Mentzer Index:** MCV/RBC count. If ** 13**, suspect IDA. 2. **RDW:** The earliest sign of IDA is an increase in RDW. 3. **Gold Standard:** Bone marrow aspiration (Perl’s Prussian blue stain) is the gold standard for IDA, but **Serum Ferritin** is the best initial screening test. 4. **FEP:** Elevated in IDA and Lead Poisoning, but normal in Thalassemia.

Q: Cryoprecipitate contains which of the following components?

Factor IX. **Explanation:** Cryoprecipitate is a concentrated subset of plasma proteins prepared by thawing fresh frozen plasma (FFP) at 1–6°C and collecting the resulting precipitate. It is primarily used to replace fibrinogen and specific clotting factors [1], [2]. **Why Factor IX is the Correct Answer (Exception-based):** The question asks for the components of cryoprecipitate, but there is a common clinical distinction to remember: **Cryoprecipitate does NOT contain Factor IX.** In the context of NEET-PG questions, if the option "Factor IX" is marked as the correct answer for a "Which of the following..." question, it is usually a "Which of the following is NOT contained" or "Except" type question. Factor IX is a vitamin K-dependent factor found in FFP and Prothrombin Complex Concentrates (PCC) [4], but it remains in the supernatant (cryo-poor plasma) during the cryoprecipitation process. **Analysis of Other Options:** * **Factor VIII (Option A):** A major component of cryoprecipitate (approx. 80–120 units per bag) [3]. Historically used for Hemophilia A [4]. * **Fibrinogen (Option C):** The most significant component (approx. 150–250 mg per bag). Cryoprecipitate is the treatment of choice for hypofibrinogenemia (<100 mg/dL) [1]. * **von Willebrand Factor (Option D):** Present in high concentrations; used when specific vWF concentrates are unavailable. * **Factor XIII:** Also present (not listed in options but high-yield). **Clinical Pearls for NEET-PG:** * **Contents of Cryoprecipitate:** Fibrinogen, Factor VIII, vWF, Factor XIII, and Fibronectin. * **Storage:** Stored at -18°C or colder; once thawed, it must be used within 6 hours (or 4 hours if pooled). * **Indication:** DIC with low fibrinogen, uremic platelet dysfunction, and Factor XIII deficiency [1]. * **Factor IX Deficiency (Hemophilia B):** Must be treated with FFP or Factor IX concentrates, **never** cryoprecipitate [3], [4].

Q: Cabot's ring is seen in which of the following conditions?

Megaloblastic anemia. **Explanation:** **Cabot’s Rings** are thin, red-purple, thread-like strands found inside red blood cells. They typically appear in the shape of a loop, a figure-of-eight, or a ring. **1. Why Megaloblastic Anemia is Correct:** Cabot’s rings are remnants of the **mitotic spindle** (microtubules) or remnants of the nuclear membrane. They occur in conditions characterized by **dyserythropoiesis** (defective red cell production). In Megaloblastic Anemia (Vitamin B12 or Folate deficiency), there is a defect in DNA synthesis leading to nuclear-cytoplasmic asynchrony [1]. This abnormal maturation results in nuclear remnants like Cabot’s rings and Howell-Jolly bodies being left behind in the cytoplasm [1]. **2. Why Other Options are Incorrect:** * **Sickle Cell Disease:** Characterized by sickle-shaped cells and Howell-Jolly bodies (due to autosplenectomy), but Cabot’s rings are not a classic hallmark. * **Iron Deficiency Anemia:** Typically shows microcytic hypochromic cells, pencil cells, and target cells. It does not involve the nuclear maturation defects required to form Cabot’s rings. * **Autoimmune Anemia:** Primarily presents with microspherocytes and polychromasia due to reticulocytosis, rather than nuclear remnants. **3. High-Yield Clinical Pearls for NEET-PG:** * **Differential Diagnosis:** Besides Megaloblastic anemia, Cabot’s rings are also seen in **Lead poisoning** (along with coarse basophilic stippling) and post-splenectomy states. * **Stain:** They are best visualized using **Romanowsky stains** (e.g., Leishman, Giemsa, or Wright stain). * **Mnemonic:** Remember **"C"** for **C**abot’s rings, **C**oarse basophilic stippling, and **C**yanide/Lead (Lead poisoning). **References:** [1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Blood And Bone Marrow Disease, pp. 593-594.

Q: JAK-2 mutation is seen in which of the following conditions?

Polycythemia Vera. **Explanation:** The **JAK2 (Janus Kinase 2)** mutation is a hallmark of **BCR-ABL1 negative Myeloproliferative Neoplasms (MPNs)**. The most common mutation is a point mutation (V617F) in exon 14, which leads to constitutive activation of the JAK-STAT signaling pathway. This results in hypersensitivity of hematopoietic stem cells to growth factors (like erythropoietin), leading to autonomous cell proliferation [1]. * **Polycythemia Vera (PV):** This is the correct answer. The JAK2 V617F mutation is present in **>95% of PV cases** [1]. It is a major diagnostic criterion according to the WHO classification. * **Idiopathic Thrombocytopenic Purpura (ITP):** This is an immune-mediated destruction of platelets (Type II hypersensitivity). It is not a clonal stem cell disorder and does not involve JAK2 mutations. * **Chronic Myeloid Leukemia (CML):** CML is characterized by the **Philadelphia chromosome [t(9;22)]**, which creates the **BCR-ABL1** fusion gene [1]. While it is an MPN, it is "BCR-ABL1 positive" and typically does not harbor the JAK2 mutation. * **Chronic Myelomonocytic Leukemia (CMML):** This is a Myelodysplastic/Myeloproliferative overlap syndrome. While mutations like TET2 or SRSF2 are common, JAK2 is rare ( 95%) > Essential Thrombocythemia (~50-60%) = Primary Myelofibrosis (~50-60%) [1]. * **PV Diagnostic Clue:** Low serum Erythropoietin (EPO) levels combined with JAK2 positivity. * **Clinical Sign:** Aquagenic pruritus (itching after a hot bath) is a classic symptom of PV. * **Treatment:** Ruxolitinib is a JAK1/2 inhibitor used in refractory cases. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Diseases of White Blood Cells, Lymph Nodes, Spleen, and Thymus, p. 624.

Q: The Donath-Landsteiner reaction is used in the diagnosis of:

Paroxysmal cold hemoglobinuria.. **Explanation:** The **Donath-Landsteiner reaction** is the gold standard diagnostic test for **Paroxysmal Cold Hemoglobinuria (PCH)**. **1. Why the Correct Answer is Right:** PCH is a rare form of autoimmune hemolytic anemia characterized by the presence of the **Donath-Landsteiner antibody**. This is a **biphasic IgG antibody** (anti-P specificity) that exhibits a unique temperature-dependent behavior: * **Cold Phase (approx. 4°C):** The antibody binds to the P-antigen on the surface of Red Blood Cells (RBCs) and fixes the early components of the complement system. * **Warm Phase (37°C):** As the blood warms to body temperature, the complement cascade is completed, leading to brisk intravascular hemolysis. The laboratory test mimics this by cooling the patient's serum and RBCs and then warming them to observe hemolysis. **2. Why the Other Options are Incorrect:** * **Malaria:** Diagnosis is primarily via peripheral blood smears (thick/thin) or Rapid Diagnostic Tests (RDTs) for plasmodium antigens. * **Whooping Cough (Bordetella pertussis):** Diagnosed via culture on specialized media (Bordet-Gengou or Regan-Lowe) or PCR. * **Anthrax (Bacillus anthracis):** Diagnosed via Gram stain (Medusa head colonies), McFadyean’s reaction (capsule staining), or the Ascoli precipitin test. **3. NEET-PG High-Yield Pearls:** * **PCH Etiology:** Classically associated with **Late Syphilis**, but currently more common in children following **viral infections** (e.g., Measles, Mumps, CMV). * **Antibody Type:** Remember it is an **IgG** antibody, which is unusual as most "cold" antibodies (like in Cold Agglutinin Disease) are IgM. * **Specificity:** It is almost always directed against the **P-antigen**.

Question 1

What is the term for localized Langerhans cell histiocytosis affecting the head and neck?

Accepted Answer

Eosinophilic granuloma

Answer

Letterer-Siwe disease

Answer

Pulmonary Langerhans cell histiocytosis

Answer

None of the above

Question 2

What is the main cause of congestive splenomegaly?

Accepted Answer

Banti syndrome

Answer

Congestive Cardiac Failure (CCF)

Answer

Malaria

Answer

Disseminated Intravascular Coagulation (DIC)

Question 3

A child presents with Hb of 6.5 gm%, MCV of 65, MCH of 15, and protoporphyria with a much reduced red cell distribution width. What is the most likely diagnosis?

Accepted Answer

Iron deficiency anemia

Answer

Thalassemia

Answer

Porphyria

Answer

Megaloblastic anemia

Question 4

Which of the following is the most important prognostic factor in ALL?

Accepted Answer

Response to steroids

Answer

Hyperdiploidy

Answer

Total leukocyte count greater than 50,000

Answer

Age

Question 5

All of the following are true regarding the diagnosis of hemolytic anemia except:

Accepted Answer

Low lactate dehydrogenase (LDH) in the blood

Answer

Elevated unconjugated bilirubin in the blood

Answer

Haptoglobin levels are decreased

Answer

Direct Coombs test is positive

Question 6

Cryoprecipitate contains which of the following components?

Accepted Answer

Factor IX

Answer

Factor VIII

Answer

Fibrinogen

Answer

von Willebrand Factor (vWF)

Question 7

Cabot's ring is seen in which of the following conditions?

Accepted Answer

Megaloblastic anemia

Answer

Sickle cell disease

Answer

Iron deficiency anemia

Answer

Autoimmune anemia

Question 8

JAK-2 mutation is seen in which of the following conditions?

Accepted Answer

Polycythemia Vera

Answer

Idiopathic Thrombocytopenic Purpura (ITP)

Answer

Chronic Myeloid Leukemia (CML)

Answer

Chronic Myelomonocytic Leukemia (CMML)

Question 9

The paraneoplastic hypercalcemia in lymphoma is due to ectopic production of which of the following?

Accepted Answer

1,25 dihydroxyvitamin D

Answer

Parathyroid hormone-related protein

Answer

Parathyroid hormone

Answer

Prostaglandin E2

Question 10

The Donath-Landsteiner reaction is used in the diagnosis of:

Accepted Answer

Paroxysmal cold hemoglobinuria.

Answer

Malaria.

Answer

Whooping cough.

Answer

Anthrax.

Hematopathology — MCQs

Hematopathology — MCQs

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